diff --git a/design_hash_map.py b/design_hash_map.py
new file mode 100644
index 00000000..cf49451e
--- /dev/null
+++ b/design_hash_map.py
@@ -0,0 +1,42 @@
+class MyHashMap:
+  def __init__(self):
+    self.primary_buckets = 1000
+    self.secondary_buckets = 1001
+    self.storage =[None for i in range(self.primary_buckets)]
+
+  def primary_hash(self, key:int)->int:
+    return key%self.primary_buckets
+
+  def secondary_hash(self, key:int)->int:
+    return key//self.primary_buckets
+
+
+  def put(self, key:int, value:int)->None:
+    primary_key = self.primary_hash(key)
+
+    if self.storage[primary_key] == None:
+      self.storage[primary_key] = [None for i in range(self.secondary_buckets)]
+      secondary_key = self.secondary_hash(key)
+      self.storage[primary_key][secondary_key] = value
+
+    else:
+      self.storage[primary_key][self.secondary_hash(key)]= value
+
+
+  def get(self, key:int)->int:
+    primary_key = self.primary_hash(key)
+
+    if self.storage[primary_key]== None or self.storage[primary_key][self.secondary_hash(key)] == None:
+      return -1
+    else:
+      return self.storage[primary_key][self.secondary_hash(key)]
+
+  def remove(self, key:int)->None:
+    primary_key = self.primary_hash(key)
+
+    if self.storage[primary_key]== None:
+        return
+    else:
+      self.storage[primary_key][self.secondary_hash(key)] = None
+
+
diff --git a/design_queue_using_stacks.py b/design_queue_using_stacks.py
new file mode 100644
index 00000000..03c526b1
--- /dev/null
+++ b/design_queue_using_stacks.py
@@ -0,0 +1,32 @@
+class MyQueue:
+
+    def __init__(self):
+        self.in_stack =[]
+        self.out_stack = []
+
+
+    def push(self, key)->None:
+        self.in_stack.append(key)
+
+
+    def pop(self)->None:
+        if not self.out_stack:
+            while self.in_stack:
+                self.out_stack.append(self.in_stack.pop())
+
+        return self.out_stack.pop()
+
+
+    def peek(self)->int:
+        if not(self.out_stack):
+            while(self.in_stack):
+                self.out_stack.append(self.in_stack.pop())
+        return self.out_stack[-1]
+
+    def empty(self)->bool:
+        if self.in_stack ==[] and self.out_stack==[]:
+            return True
+        return False
+
+
+